Drill.



Patentd May 20, 1913 awwwtoz z 9 a 5 7 m 4 2 6 a 9 p. a k v p f a 6X i/V////////// r//// 7 7 7 VW- 9\ v a 9 r 2 9 G. LORD.

DRILL.

APPLICATION FILED JAN. 3, 1918.

struction is also such that both plates may be UNITED STATES CHARLESLORD, OF MINERSVILLE, PENNSYLVAHIA.

DRILL.

Specification of Letters fi'atent.

Patented May 20, 1913.

Application filed I anus-r1 8, 1918. Serial Io. 740,018.

' To all whom it may. concern:

Be it known that 1, CHARLES. Loan, a

citizen of the United States, residing at and has for its object theprovision of a I drill wherein will be included separable shank andcutting portions and means for strengthening the portions at the jointbetween their points of connection and for positively preventing theseparation of the cutting portion from the shank during the cuttinoperation. 2

Wit this and other objects in view, the

invention consists of certain novel features of construction,combination and arran ement of parts, as will be hereinafter escribedand claimed. p In the accompanying drawings :Figure 1 is a perspectiveview of the tool, showin the parts assembled. Fig. 2 is a verticalongitudinal section therethrough; and Fig. 3 is a section on line 33 ofFig. 2.

The tool comprises separable shank and cutting portions 1 and 2,respectively, which are each of the same transverse diameter whereby thetool may be driven into the material to an portion of the length of thetool, as is evi ent. The section or cutting portion 2 is providedthrough its axial center with a rectangular, relatively short socket 3,which is adapted to receive a correspondingly formed tang 4 on theattachingv end of the shank 1. The rectan lar configuration of the tank4 is pre erable, in that the fiat sides of the tang will lie in mutualcontact with the flat walls of the socket so as to resist any tendencyof the companion portions 1 and 2 to rotate relatively when strikingpressure is brought upon the tool.

The shank 1 is provided at diametrically opposite points with grooves 5,which are adapted to register or to aline with similar grooves 6 iniametrically opposite sides of the cutting portion 2 and to receivetherewith couplmg and reinforcin plates 7. The

ends of the plates are beve ed, as at 8, so. as to snugly underlie theunder-cut end walls 9 of the recesses 5 and 6, so that the plates areheld against lateral displacement when the sections 1 and 2 are coupled.Th1s conoperatively retained upon the tool through the provision of asingle fastening screw 10. This screw has an outer portion or head lyingflush with the outer surface of one of the plates, while the shank ofthe screw is extended through an aperture 11 in the cuttmfiportion 2and, then threadedly fitted in .a s rt bore 12 in-the tang 4.

Now that the details of construction of the tool are clearly described,it is said that on the initial connection of the companion portions 1and 2, "the tang 4 is extended part way into'the receiving socket 3 ofthe portion 2. The reinforcing plates 7 are then associated with thetool at diametrically opposite points thereon and arranged so as to'through one of the plates and through the aperture 12 and thenoperatively fitted in the bore 12 of the connecting tang 4. Both toolportions 1 and 2 are then held properly connected with each other; thejoint between the tool portions strengthened and the tool portions aresecurely held against relative rotation. The

user of the tool may supply himself with any desired number of cuttingportions 2 so that a worn or broken portlon may be quickly removed and anew one substituted therefor at a minimum cost and with the maximumsaving of time and labor. It is stated that the rectangular shape of thetongue 4 is desirable in that the tool see tions will be held againstrotation on the initial connection of said ortions and as a consequencealinement of t e grooves 5 with 1 undercut walls, plates lying withinthe longitugrooves and having beveled extremities unerlying the undercutwalls whereby the plates are heldagainst lateral displacement, and asingle fastening device extending through one of the plates andremovably fitted with the shank portion and the cut portion.

2. A drill comprising a cutting portion and a shank portion, the cuttingportion 10 having a rectangular socket therein, the

shank portion having a rectangular tang extending into the socket, thecutting portion havlng grooves therein at diametrically opposite sides,the shank having grooves therein at diametrically opposite sides adaptedto register with eac other when the tan is extended into the socket,means for hol ing the plates agalnst lateral displacement, and aastening device extending through one of the plates and through thecutting portion and removably fitted m the tan v 1% testimon whereof Iaflix my signature in presence 0 two witnesses.

' CHARLES LORD.

Witnesses:

J. F. Farms, Joan J, BRENNAN.

